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| author |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-10-15 11:31:54 +1100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-10-15 11:31:54 +1100 |
| commit | 6dc6472581f693b5fc95aebedf67b4960fb85cf0 (patch) | |
| tree | 06a5a9a08519950575505273eabced331ed51405 /include/linux/compiler.h | |
| parent | powerpc: Fix CHRP PCI config access for indirect_pci (diff) | |
| parent | Merge branch 'for-2.6.28' of git://linux-nfs.org/~bfields/linux (diff) | |
| download | linux-dev-6dc6472581f693b5fc95aebedf67b4960fb85cf0.tar.xz linux-dev-6dc6472581f693b5fc95aebedf67b4960fb85cf0.zip | |
Merge commit 'origin'
Manual fixup of conflicts on:
arch/powerpc/include/asm/dcr-regs.h
drivers/net/ibm_newemac/core.h
Diffstat (limited to 'include/linux/compiler.h')
| -rw-r--r-- | include/linux/compiler.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index c8bd2daf95ec..8322141ee480 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -190,7 +190,9 @@ extern void __chk_io_ptr(const volatile void __iomem *); * ACCESS_ONCE() in different C statements. * * This macro does absolutely -nothing- to prevent the CPU from reordering, - * merging, or refetching absolutely anything at any time. + * merging, or refetching absolutely anything at any time. Its main intended + * use is to mediate communication between process-level code and irq/NMI + * handlers, all running on the same CPU. */ #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) |